如图一共有颗草莓每次吃3颗吃次可以吃完图中草莓总数为9

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--- ## Question 1 **Question content**: 如图，一共有（）颗草莓，每次吃3颗，吃（）次可以吃完。（图中草莓总数为9） **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 9, 3 ### Detailed problem-solving steps 1. **Count total strawberries**: By observing the image, there are 9 strawberries. 2. **Calculate eating times**: Total strawberries ÷ per - time quantity = 9 ÷ 3 = 3. ### Knowledge points involved 1. **Counting objects** - Detailed interpretation: Recognize and count the number of objects (strawberries) to determine the total quantity, a foundational skill for number sense. 2. **Division in practical scenarios** - Detailed interpretation: Use division (or repeated subtraction) to solve "grouping" problems (e.g., 9 strawberries, 3 per meal → 3 meals). 3. **Basic arithmetic operations** - Detailed interpretation: Reinforce addition/subtraction as repeated operations (e.g., 9 - 3 - 3 - 3 = 0, 3 times). --- ## Question 2 **Question content**: 最大的一位数是（），再加上1就是（）。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 9, 10 ### Detailed problem-solving steps 1. **Identify the largest one - digit number**: One - digit numbers range from 0 - 9, so the largest is 9. 2. **Add 1 to the largest one - digit number**: 9 + 1 = 10. ### Knowledge points involved 1. **One - digit numbers** - Detailed interpretation: Understand the range (0 - 9) and magnitude of one - digit numbers. 2. **Number comparison** - Detailed interpretation: Identify the maximum value in a set (one - digit numbers) to determine 9 is the largest. 3. **Addition operation** - Detailed interpretation: Perform 9 + 1 = 10 to understand number progression (9 → 10, a two - digit number). --- ## Question 3 **Question content**: 算一算，填一填。 7 + 3 = 5 + □ □ + □ □ + □ 9 - 6 = 8 - □ 7 - □ 6 - □ **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 7 + 3 = 10; 5 + 5 = 10, 4 + 6 = 10, 2 + 8 = 10 (or other valid pairs); 9 - 6 = 3; 8 - 5 = 3, 7 - 4 = 3, 6 - 3 = 3 ### Detailed problem-solving steps 1. **Solve 7 + 3**: 7 + 3 = 10. 2. **Find addition pairs for 10**: Use subtraction (10 - 5 = 5) for 5 + □, and identify other pairs (e.g., 4 + 6, 2 + 8) that sum to 10. 3. **Solve 9 - 6**: 9 - 6 = 3. 4. **Find subtraction pairs for 3**: Use addition (8 - 3 = 5) for 8 - □, and identify other pairs (7 - 4, 6 - 3) that result in 3. ### Knowledge points involved 1. **Addition/subtraction facts (sums of 10, differences of 3)** - Detailed interpretation: Memorize or derive arithmetic facts (e.g., 10 = 5 + 5, 3 = 8 - 5) for fluency. 2. **Inverse operations** - Detailed interpretation: Use subtraction to find addends (10 - 5 = 5) and addition to find subtrahends (8 - 3 = 5). 3. **Number bonds** - Detailed interpretation: Understand how numbers combine (e.g., 10 = 5 + 5) or separate (e.g., 8 - 5 = 3) for mental math. --- ## Question 4 **Question content**: 按顺序填□里的数（数线：0,1,□,3,4,5,□,□,□,□,10）。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 0, 2, 6, 7, 8, 9 ### Detailed problem-solving steps 1. **Identify the number sequence**: The sequence is 0 - 10 in ascending order. 2. **Fill missing numbers**: - Before 1: 0 (since 0 < 1). - Between 1 and 3: 2 (since 1, 2, 3 is sequential). - After 5: 6, 7, 8, 9 (since 5, 6, 7, 8, 9, 10 is sequential). ### Knowledge points involved 1. **Number sequence (0 - 10)** - Detailed interpretation: Recognize the order of numbers from 0 - 10 to understand counting progression. 2. **Number line recognition** - Detailed interpretation: Read and fill a number line to visualize number order and magnitude. 3. **Missing number in a sequence** - Detailed interpretation: Identify gaps in a sequence (e.g., between 1 - 3, 5 - 10) to reinforce number sense. --- ## Question 5 **Question content**: 把算式按得数从大到小的顺序排一排：10 - 4, 1 + 7, 6 + 3, 8 - 5, 4 + 6。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 4 + 6 > 6 + 3 > 1 + 7 > 10 - 4 > 8 - 5 ### Detailed problem-solving steps 1. **Calculate each算式's result**: - 10 - 4 = 6; 1 + 7 = 8; 6 + 3 = 9; 8 - 5 = 3; 4 + 6 = 10. 2. **Order results from largest to smallest**: 10 > 9 > 8 > 6 > 3, so 4 + 6 > 6 + 3 > 1 + 7 > 10 - 4 > 8 - 5. ### Knowledge points involved 1. **Addition/subtraction operations** - Detailed interpretation: Perform basic arithmetic to find results (e.g., 4 + 6 = 10). 2. **Number comparison (greater than/less than)** - Detailed interpretation: Compare results (10, 9, 8, 6, 3) to determine magnitude order. 3. **Ordering numbers** - Detailed interpretation: Arrange numbers in descending order to reinforce number magnitude. --- ## Question 6 **Question content**: 如果一次只能端两盘山竹，那么一次最多能端走（）个山竹，最少能端走（）个山竹（三盘山竹数量：3, 4, 5）。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 9, 7 ### Detailed problem-solving steps 1. **Identify plate quantities**: Three plates have 3, 4, 5 mangosteens. 2. **Find maximum sum (two plates)**: Choose the two largest (4 and 5), sum = 4 + 5 = 9. 3. **Find minimum sum (two plates)**: Choose the two smallest (3 and 4), sum = 3 + 4 = 7. ### Knowledge points involved 1. **Addition of two numbers** - Detailed interpretation: Add quantities of two plates (e.g., 4 + 5 = 9) to find total. 2. **Maximum/minimum values** - Detailed interpretation: Identify largest/smallest values in a set (3, 4, 5) to optimize the sum. 3. **Combination of quantities** - Detailed interpretation: Choose two out of three plates and calculate their sum, introducing combinatorial thinking. --- ## Question 7 **Question content**: 下列算式与5 + 4得数相等的是（）（选项：①8 - 2 ②2 + 7 ③10 - 4）。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer ② ### Detailed problem-solving steps 1. **Calculate 5 + 4**: 5 + 4 = 9. 2. **Calculate each option**: - ① 8 - 2 = 6; ② 2 + 7 = 9; ③ 10 - 4 = 6. 3. **Compare with 5 + 4**: Only ② (2 + 7 = 9) matches. ### Knowledge points involved 1. **Addition/subtraction operations** - Detailed interpretation: Perform arithmetic for 5 + 4, 8 - 2, 2 + 7, 10 - 4. 2. **Equivalent expressions** - Detailed interpretation: Identify expressions with the same result (9) as 5 + 4. 3. **Number comparison** - Detailed interpretation: Compare results (9, 6, 9, 6) to find a match. --- ## Question 8 **Question content**: 下面卡片上的数可以和3凑成8的是（）（选项：①4 ②5 ③6）。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer ② ### Detailed problem-solving steps 1. **Understand "凑成8"**: Find a number x where 3 + x = 8. 2. **Solve for x**: 8 - 3 = 5, so the number is 5 (option ②). ### Knowledge points involved 1. **Addition/subtraction inverse relationship** - Detailed interpretation: Use subtraction (8 - 3 = 5) to find an addend when the sum (8) and another addend (3) are known. 2. **Number bonds (8 = 3 + 5)** - Detailed interpretation: Recognize that 3 and 5 combine to make 8. 3. **Option evaluation** - Detailed interpretation: Check options (4, 5, 6) to find the correct number (5). --- ## Question 9 **Question content**: 可以表示算式“7 + 2”的是（）（选项需结合图分析，假设①为正确表示）。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer ① ### Detailed problem-solving steps 1. **Understand 7 + 2**: Represents adding 2 to 7 (result = 9). 2. **Analyze options**: - ① Likely shows 7 objects + 2 objects (addition). - ②/③ Likely show subtraction (e.g., 7 - 2). 3. **Choose the addition - representing option**: ①. ### Knowledge points involved 1. **Addition representation (concrete models)** - Detailed interpretation: Use diagrams (sticks, objects) to model addition (7 + 2). 2. **Interpreting visual models** - Detailed interpretation: Analyze diagrams to distinguish addition/subtraction. 3. **Arithmetic operation identification** - Detailed interpretation: Recognize that 7 + 2 is addition and match it to the correct diagram. --- ## Question 10 **Question content**: 看图列式错误的是（）（选项：①6 + 4 = 10 ②6 - 4 = 2 ③10 - 4 = 6）。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer ② ### Detailed problem-solving steps 1. **Understand the diagram (total = 10, parts = 6, 4)**: - ① 6 + 4 = 10 (correct, sum of parts). - ② 6 - 4 = 2 (incorrect, not related to total 10). - ③ 10 - 4 = 6 (correct, total - part = other part). ### Knowledge points involved 1. **Addition/subtraction equations (number bonds for 10)** - Detailed interpretation: Understand 10 = 6 + 4, so 10 - 4 = 6, 6 + 4 = 10. 2. **Correct/incorrect equations** - Detailed interpretation: Identify equations that match the diagram (total - part = part, part + part = total). 3. **Model - based problem - solving** - Detailed interpretation: Use a diagram to verify arithmetic equations. --- ## Question 11 **Question content**: 一共有10个木桶，画了7个，还差（）个木桶。 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 3 ### Detailed problem-solving steps 1. **Understand the problem**: Total = 10, drawn = 7, find missing = 10 - 7. 2. **Calculate 10 - 7**: 10 - 7 = 3. ### Knowledge points involved 1. **Subtraction (part - whole relationship)** - Detailed interpretation: Use subtraction to find the missing part (10 - 7 = 3) when total and one part are known. 2. **Counting and total quantity** - Detailed interpretation: Recognize total (10) and drawn (7) to find the difference. 3. **Basic subtraction facts (10 - 7 = 3)** - Detailed interpretation: Memorize 10 - 7 = 3 for fluency. --- ## Question 12 **Question content**: 直接写出得数： 2 + 4 = 10 - 5 = 2 + 8 = 2 + 4 - 3 = 4 + 4 = 7 - 0 = 9 - 4 = 10 - 0 + 2 = **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 6, 5, 10, 3, 8, 7, 5, 12 ### Detailed problem-solving steps 1. **2 + 4**: 2 + 4 = 6. 2. **10 - 5**: 10 - 5 = 5. 3. **2 + 8**: 2 + 8 = 10. 4. **2 + 4 - 3**: 2 + 4 = 6; 6 - 3 = 3. 5. **4 + 4**: 4 + 4 = 8. 6. **7 - 0**: 7 - 0 = 7 (subtracting 0 leaves the number unchanged). 7. **9 - 4**: 9 - 4 = 5. 8. **10 - 0 + 2**: 10 - 0 = 10; 10 + 2 = 12. ### Knowledge points involved 1. **Basic addition/subtraction facts** - Detailed interpretation: Memorize facts like 2 + 4 = 6, 10 - 5 = 5. 2. **Order of operations (left - to - right for mixed operations)** - Detailed interpretation: Perform operations left - to - right (e.g., 2 + 4 - 3, 10 - 0 + 2). 3. **Subtraction with zero** - Detailed interpretation: Understand 7 - 0 = 7 (subtracting 0 doesn’t change the number). --- ## Question 13 **Question content**: 圈一圈，填一填： (1) ○○○ 3 + □ = 7 (2) □ + 2 = 8 **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer (1) 4 (circle 4 more ○s); (2) 6 ### Detailed problem-solving steps 1. **Problem (1)**: - To find □, solve 7 - 3 = 4. Circle 4 more ○s to make 7. 2. **Problem (2)**: - To find □, solve 8 - 2 = 6. ### Knowledge points involved 1. **Addition/subtraction inverse relationship** - Detailed interpretation: Use subtraction (7 - 3 = 4, 8 - 2 = 6) to find missing addends. 2. **Visual representation (circling objects)** - Detailed interpretation: Use circles to model the missing quantity (e.g., 3 + 4 = 7). 3. **Number bonds** - Detailed interpretation: Recognize 3 + 4 = 7, 6 + 2 = 8. --- ## Question 14 **Question content**: 算一算，填一填： 7 - 2 = □ □ - 4 = □ □ + 9 = □ □ - 3 = □ □ - 5 = □ **Discipline**: Mathematics **Grade**: First grade (primary school) ### Correct answer 5, 5, 1, 1, 10, 10, 7, 7, 2

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